JPH0964832A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a capacity of a memory storing data and to reduce the processing load in the receiver for an FM teletext broadcast program. SOLUTION: The receiver is provided with a memory storing received data and a display element displaying a character according to the data from the memory. The memory is provided with a data storage area DSTR and a data management table DMNG. When a packet is received, data to specify a program are registered in the data management table DMNG so that the data are not in duplicate. A data block is stored in the data storage area DSTR and data denoting a storage area of a data block preceding or succeeding to the stored data block are stored in the data storage area DSTR. Data representing a storage address of a head data block among data blocks of the same program and the same page written in the data storage area DSTR are stored in the data management area DMNG for each of the data specifying the program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for receiving teletext broadcasting.

[0002]

2. Description of the Related Art In FM broadcasting, it is called "FM character multiplex broadcasting".
It has been realized that data such as character information is multiplexed and transmitted, and a receiving side displays characters and the like according to the transmitted data.

[0003] This FM teletext broadcasting is called the DARC system, and the standard for multiplexing digital data such as text information is a subcarrier frequency: 76 kHz, a transmission rate: 16 kbit / s, a modulation method: LMSK error correction. Method: Product code using (272,190) shortened difference set cyclic code.

There are distinction between levels 1, 2, and 3 as a program service such as character information. All of these are for displaying (presenting) character information etc. by dot display, but Level 1 is a service for receivers that can display 15.5 characters × 2.5 lines including the header part,
Information is text. Level 2 is a service for a receiver capable of displaying 15.5 characters x 8.5 lines including a header part, and the information is characters and figures. Level 3 is a traffic information service for a receiver that can display a detailed map on a CD-ROM, that is, a navigation system.

As the level 1 program service, news, weather forecast, traffic information, entertainment and main complementary programs are considered. In this case, entertainment includes fortune telling, listener message boards,
It provides information such as quizzes and town information.

The main supplementary program provides supplementary information of the program such as the music title, performer name, telephone number / FAX number at the time of request when the original audio broadcast is a music program. To do. In the following, the main complementary programs will be "program information" or "program link".
Called.

Further, as a program service other than the above,
"Urgent information" provided at any time when there is an urgent need
Is also considered.

[Data Structure] FIG. 8 shows a frame structure of a data signal multiplexed in the FM character multiplex broadcasting. One frame of this data signal is composed of 272 blocks, and each block has 288 bits.

The 272 blocks of one frame are divided into 190 data packet blocks and 82 vertical parity packet blocks, and the vertical parity packet blocks are distributed within the frame. Sent out.

A 16-bit BIC (block identification code) is added to the beginning of each block. This BI
Four types of C are used as C, thereby distinguishing each parity packet and identifying the beginning of the frame.

The block of the data packet is BI
C is followed by a 176-bit data packet, followed by a 14-bit CRC code, followed by 82 bits.
It has a horizontal parity check code of bits.

In this case, the CRC code is added to detect the residual error after the error correction by the product code. The block of the vertical parity packet has a 272-bit vertical parity packet following the BIC.

As shown in FIG. 9, each data packet has a 32-bit prefix followed by 144 bits.
And a data block of bits.

As shown in FIG. 9, this prefix is composed of a service identification code, a decoding identification flag, an information end flag, an update flag, a program number, a page number, a data link code, and a data packet number.

The service identification code is a 4-bit code for identifying the content of a program, etc., and for level 1, 1: general information for sequential reception processing 2: general information for recording reception processing 4: traffic It is considered as information.

Here, the successive reception process is a mode in which the display decoding process is started as soon as the first data packet of program data or page data arrives at the receiver. Then, in the case of a program for which the transmitting side needs a timing of display on the receiving side or a program which cannot be displayed in time if the decoding process is started after the final packet of the data group is obtained, this sequential reception process It is said that

The recording / reception processing is a mode in which all the data of program data or page data is received and recorded, error correction processing is performed by the CRC code for each data group, and then the decoding processing of the display is started. . Therefore, the display timing of the program of this recording and receiving process can be controlled on the receiver side.

Further, the decoding identification flag is 1 bit,
It is set to "1" when the error correction circuit of the receiver outputs the data by decoding only in the horizontal direction, and is set to "0" when outputting the data after decoding in the horizontal direction and the vertical direction.

In the successive reception process, when the decoding identification flag is "0", the receiver receives the first BIC of each data packet and receives the first BIC of the data packet 302 packets later. At this point, it is specified to perform a decoding process for displaying each data packet.

The information end flag is 1 bit and is set to "1" when the data group to be transmitted with a certain data group number ends, and "0" otherwise.
It is said. Furthermore, the update flag is 2 bits and is incremented by 1 each time the data group is updated. Further, the program number is 8 bits and the page number is 6 bits, and the data group number is constituted by both.

Further, the program numbers are from 0 to 255, 0: general table of contents (main menu) 1-253: general programs (news, weather forecast, etc.) 254: main complementary programs (program information or program link) 255: Allocated as in emergency information.

The page numbers are from 1 to 62,
Therefore, one program has a maximum of 62 pages. One page is composed of one or a plurality of data groups, and one data group is composed of one or a plurality of data blocks.

Further, since the data link code is 2 bits and the data that should belong to one data group is a large amount of data such that the number of packets exceeds the maximum value of the data packet number, the maximum is possible. It is a code for linking in the order of 0 → 1 → 2 → 3 between the data groups when divided into four data groups and transmitted by the same data group number with different data link codes.

The data packet number is 8 bits and is assigned in order from "0" to indicate the order of data packets in one program. That is, it indicates the number of the data packet in one program. Therefore, on the same page of the same program, the service identification code, the program number, and the page number are the same. Alternatively, if the service identification code, the program number and the page number are the same in a plurality of data packets, the data packet is
It is a packet forming the same page of the same program.

At level 1, one page is generally in the display format of 15.5 characters × 2.5 lines,
The display format can be 5.5 characters x 8.5 lines. Also,
The character data in this case is to specify the character to be displayed by the JIS code or the like.

[Display Example of Program] As shown in FIG. 10, a receiver corresponding to level 1 has a display element such as an LCD.
A DSP is provided and its display area SCRN is 15.5
The size is character x 2.5 lines (width 248 dots x height 40 dots). However, of the display area SCRN, the upper 0.5 line area is the header text display area, and the lower 2 row area is the text display area.

Then, when the receiver receives the character multiplex broadcast, as shown in FIG. 11A, the display area SCR of the display element DSP is displayed.
The total table of contents (main menu) is displayed in N. However, FIG. 11A shows a state in which the total table of contents covers a plurality of pages, and the first one of them is displayed.

When a predetermined key is operated in such a state, the display area SCRN is displayed as shown in FIG. 11B.
Displays the next page.

Then, when the user selects and decides the number of the item to be viewed from the total contents, the contents of the selected and decided item are displayed. For example, when the user selects “3. Weather forecast” from the total table of contents, as shown in FIG. 11C, “1. Today's weather”,
A table of contents such as "2. Tomorrow's weather" is displayed.

Further, when the user selects and determines the number of the item to be viewed from the table of contents, the first page of the selected and determined item is displayed. For example, when the user selects "1. Today's weather" from the above table of contents, "Today's weather" is displayed, as shown in FIG. 11D.
The specific character information about is displayed.

[0031]

As described above and as shown in FIG. 9, in the FM character multiplex broadcasting, the character data of each program is divided into 144 bits and packetized. , This packet (data packet) is transmitted as a unit. Therefore, FM
In a character multiplex receiver, necessary data packets are collected and a target program is displayed.

By the way, in the case of a weather forecast, for example, the number of data packets varies depending on the forecast content, that is, the number of characters, but is usually about 10. At this time, in the corresponding data packet, the data packet number at the end of the prefix is 0-9.

Therefore, in the case of a weather forecast, when data packets are collected for display, a memory area of (32 + 144) bits × 10 data packets = 1760 bits is required. In other words, one program requires a considerable memory area.

The present invention is intended to solve such a problem.

[0035]

Therefore, in the present invention, the text data of the program body is divided into a plurality of data blocks for each predetermined data amount, and the program is specified for each data block. And a data indicating the order of the data blocks, and a receiver circuit for receiving the character multiplex broadcast in a receiver for receiving the character multiplex broadcast in which the packet is multiplexed into a main signal. And a memory for storing the data received by the receiving circuit, and a display element for displaying characters according to the data read from the memory, and the memory has a data storage area,
A data management table is provided, and when the above-mentioned packet is received, the data specifying the program among the received packets is registered in the above-mentioned data management table so that the data does not overlap, and the received packet is received. Of these, while storing the data block in the data storage area, for each of the stored data blocks,
Data indicating the storage position of the data block before or after this data block is stored in the data storage area, and the data management area has the same data storage area for each data specifying the program. In the receiver, the data indicating the storage position of the first data block of the program data blocks is written.

Therefore, the received data packet is
The data blocks in the data packet are stored in the memory and managed.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG.
1 shows one form of a signal system when applied to an M receiver. Further, this FM receiver is a case having a level 1 receiving capability for FM text multiplex broadcasting.

That is, the FM signal received by the antenna 11 is supplied to the synthesizer-type tuner circuit 12 to select a broadcasting station having a target frequency, and the FM signal is converted into an intermediate frequency signal. This intermediate frequency signal is sent to the FM demodulation circuit 1 through the intermediate frequency amplifier 13.
4 is supplied.

In this way, from the demodulation circuit 14, the summed signal (L + R) of the stereo left and right channel audio signals L and R, the DSB signal balanced-modulated by the difference signal (LR), and the pilot signal. And the above-mentioned F
A frequency multiplexed signal with the LMSK signal in M teletext is extracted.

Then, this frequency-multiplexed signal is supplied to the stereo demodulation circuit 15, and the added signal (L + R) and D are added.
Audio signals L and R are demodulated from the SB signal, and these signals L and R are supplied to left and right channel speakers 17L and 17R through amplifiers 16L and 16R.

Further, the FM receiver is provided with a microcomputer 20 for selecting a channel in the tuner circuit 12 and displaying characters by FM character multiplex broadcasting.

That is, this microcomputer 20
Is a CPU 21 for executing the program, and a ROM
22, a RAM 23 for a work area, and a RAM 24 for a reception buffer of data of FM character multiplex broadcasting. In this case, the ROM 22 is written with various routines and data for displaying a predetermined character string (sentence), and a data storage routine 100 shown in FIG. 2 is provided as a part of the routine. .
The details of this routine 100 will be described later.

The RAM 23 has a data storage area DSTR and a data management table DM as shown in FIG. 3, for example.
NG and is prepared.

In this case, the data storage area DSTR is an area for storing the data block of the data packet,
For example, it is composed of 2048 sets of areas, and 11-bit serial numbers starting from "0" are given to the 2048 sets of areas.

The 2048 sets of areas include, for each set, an 8-bit area for storing a data packet number and a 1-bit area for storing an information end flag.
It has a 144-bit area for storing a data block and an 11-bit area for storing the data of "the storage area number of the next data block".

Here, "the number of the storage area of the next data block" means that the next data block (which is not necessarily the next continuous data block) of the data blocks forming one program is stored. This is a number indicating in which area of the area DSTR the data is stored. That is,
When there are a plurality of data blocks, it is data indicating the front-rear relationship, and the front-rear relationship is indicated by the area number in the storage area DSTR.

The data management table DMNG is an area
It is a table that manages the data blocks stored in the DSTR for each program. Therefore, this storage table DMNG is
Each program has a column showing the correspondence between the service identification code, the program number, the page number, and the update flag in the data packet of the program, and the "number of the storage area of the first data block" of the program.

Here, "the number of the storage area of the head data block" means which number of the area DSTR is the most head data block which can be obtained at the present time among the data blocks constituting one program. It is a number indicating whether the area is stored.

The number of bits in the fields of service identification code to update flag is made equal to that in the data packet. Further, the column of the storage area number of the first data block has a size of 11 bits corresponding to the number of storage areas DSTR.

The memories 22 to 24 are connected to the CPU 21 through the system bus 29 and the bus 2
Interface circuits (ports) 25 to 28 are connected to 9.

Further, the interface circuit 25 supplies the tuner circuit 12 with data for channel selection, and the channel selection is executed. In addition, the demodulated signal from the demodulation circuit 14
The data in the FM character multiplex broadcast is decoded and taken out from the LMSK signal supplied to the decoder circuit 41, and this data is read through the interface circuit 26 to R
Written in the AM 24, the data in the RAM 24 is constantly updated with the latest data.

The interface circuit 27 is also connected with various operation keys 42 composed of non-lock type push switches, and the key output thereof is taken into the microcomputer 20. Thus, the key 42
If you press any of the keys, the pressed key will
The determination is made by U21, and the process corresponding to the pressed key is executed.

However, when the FM receiver is mounted on a vehicle,
Since the operation panel is narrow and a large number of operation keys cannot be arranged, in this example, the keys 42 are only the keys with high operation frequency and the important keys, and the other operations are remote control (remote operation). ).

Therefore, the receiving circuit 43 of the remote controller is also connected to the interface circuit 27. In this example, the remote controller is of the infrared type, and the receiving circuit 43 includes a light receiving element for receiving infrared rays from the transmitter 60 of the remote controller and a decoder circuit for decoding the remote control signal from this light receiving element. Have and.

Further, the remote controller transmitter 60 is also provided with various operation keys 62 (62A to 62N) constituted by non-lock type push switches. Although a part of the key 62 has the same function as the key 42, when any key of the keys 62 is pressed, data corresponding to the pressed key is formed, and the data is converted into infrared rays to be converted into the FM receiver. Sent to.

In the FM receiver, the transmitter 6
When the infrared ray transmitted from 0 is received by the receiving circuit 43, the original data is taken out and this data is supplied to the interface circuit 27. Thus, the key 42
When the key 62 is pressed, the processing corresponding to the pressed key is performed by the microcomputer 20 as in the case of pressing.
Is executed by In the following, the transmitter 60
The operation of each part will be described depending on the case where the key 62 of is used.

Further, a beep sound signal forming circuit 44 is connected to the interface circuit 28, and the beep sound signal is supplied to the amplifiers 16L and 16R.

Further, the bus 29 is connected to a font ROM (character generator) 31 having font data for converting a character code sent by FM character multiplex broadcasting into display data, and a display memory. 32 and a display controller 33 are connected, and an LCD 50, for example, is connected to the controller 33 as a display element.

In this case, the LCD 50 has, for example, a configuration similar to that of the display element DSP described above, and has 15.5 characters × 2.5 lines (horizontal width).
It has a display capacity of 248 dots x 40 dots vertically). The memory 32 is of a bitmap type corresponding to the dot display type of the LCD 50 and has a capacity of one screen. In the following, a teletext program is performed at level 1, and one page has the size (capacity) of one screen.

Then, the character code held in the RAM 24 is read by the CPU 21, the read character code is converted into display data using the font data of the ROM 31, and this display data is stored in the memory 3.
Written to 2. At this time, the controller 33
Thus, the display data in the memory 32 is repeatedly read, converted into a display signal, and supplied to the LCD 50. Therefore, in the LCD 50, the CPU 21
The characters of the character code read from M24 are displayed.

In such a configuration, when the program by the character multiplex broadcasting is received and the error-corrected data packet is supplied to the microcomputer 20,
The contents of the RAM 23 are changed, for example, as shown in FIGS. 4 to 7, and the data is stored in the RAM 23.

In FIGS. 4 to 7, the data storage area DSTR and the data management table DM are shown due to space limitations.
We are reducing the number of NG areas. Also, the storage area DS
The TR and the management table DMNG are initially empty for simplicity.

Now, as a data packet, FIG.
As shown in the upper part of the above, a packet whose prefix is a service number code: 2 information end flag: 1 update flag: 0 number group: 10 page number: 1 data packet number: 3 , And is supplied to the microcomputer 20.

Then, as shown in the middle of FIG. 4, the data packet number "3", the information end flag "1" and the data block of the current data packet are stored in the area "0" of the storage area DSTR. Is stored.

Further, the data block which is the next data block of the current data block is still in the storage area.
Since it is not stored in the DSTR (or the information end flag is "1"), the area of the storage area number of the next data block in the storage area DSTR remains "empty".

Further, the management table DMNG does not yet store the service number code "2" to the update flag "0" of the program by the current data packet.

Therefore, as shown in the lower part of FIG. 4, the service number code “2” to the update flag “0” of the current data packet are written in the management table DMNG. Further, since the data block of the data packet this time is written in the area of the storage area DSTR number "0", the number "0" is stored in the storage area number column of the first data block in the management table DMNG. Is written.

Next, as a data packet, as shown in the upper part of FIG. 5, its prefix is: service number code: 2 information end flag: 0 update flag: 0 group number: 10 page number It is assumed that the packet having the number: 1 data packet number: 0 is supplied to the microcomputer 20.

Then, as shown in the middle part of FIG. 5, the data packet number "3", the information end flag "1" and the data block of the current data packet are stored in the area "1" of the storage area DSTR. Is stored.

Furthermore, the data block of this time (FIG. 5)
Is data of the same page of the same program as the previous data block (FIG. 4) (the service identification code, the program number, and the page number are the same). Then, the current data packet number “0” <the previous data packet number “3”. That is, the order of the data blocks (the context)
Is the current data block → the previous data block.

Therefore, the number "0" stored in the previous data block is stored in the area of the storage area number of the next data block in the storage area DSTR.

Further, in the management table DMNG, the service identification code "2" to the update flag "0" of the program by the current data packet are already stored by the previous data packet. Further, as described above, the data packet number “0” of the current data packet is smaller than the data packet number “3” of the previous data packet, and this data packet is the head side.

Therefore, as shown in the lower part of FIG. 5, in the column of the storage area number of the first data block in the management table DMNG, the storage area number "1" of the data block of the current data packet in the area DSTR. Is written.

Next, as a data packet, as shown in the upper part of FIG. 6, its prefix is a service number code: 1 information end flag: 0 update flag: 0 number group: 85 page number. No .: 6 It is assumed that the packet having the data packet number: 5 is supplied to the microcomputer 20.

Then, as shown in the middle part of FIG. 6, the data packet number "5", the information end flag "0" and the data block of the current data packet are stored in the area "2" of the storage area DSTR. Is stored.

Furthermore, the data block that is the next data block after the current data block is still in the storage area.
Since it is not stored in the DSTR, the area of the storage area number of the next data block in the storage area DSTR remains "empty".

Further, the management table DMNG does not yet store the service identification code "1" to the update flag "0" of the program by the current data packet.

Therefore, as shown in the lower part of FIG. 6, the service identification code “1” to the update flag “0” of the program by the current data packet are written in the management table DMNG. Further, since the data block of the data packet this time is written in the area of the storage area number "2", the number "2" is stored in the storage area number column of the first data block in the management table DMNG. Written.

Further, at this time, sorting is performed, and the data in the management table DMNG is sorted so that the service identification codes are in the normal order.

Next, as a data packet, as shown in the upper part of FIG. 7, its prefix is a service number code: 2 information end flag: 0 update flag: 0 number group: 10 page number. Number: 1 It is assumed that the packet having the data packet number: 1 is supplied to the microcomputer 20.

Then, as shown in the middle part of FIG. 7, the data packet number "1", the information end flag "0" and the data block of the current data packet are stored in the area "3" of the storage area DSTR. Is stored.

Further, this time data block (FIG. 7)
Is data of the same page of the same program as the data blocks of FIGS. 4 and 5. Then, the data packet number “0” in FIG. 5 <the current data packet number “1” <the data packet number “3” in FIG. 4. That is, the order of the data blocks is data block in FIG. 5 → current data block → data block in FIG.

Therefore, in the area having the storage area number of the next data block in the area having the number "1" in the storage area DSTR, the data "0" has the number "3" in which the data block of this time is stored. Is changed to. Further, the number "0" in which the data block of FIG. 4 is stored is stored in the column of the storage area number of the next data block in the area of number "3" in the storage area DSTR.

Further, in the management table DMNG, the service identification code "2" to the update flag "0" of the program by the current data packet are already stored by the data packet of FIG. Furthermore, the data packet number “1” of the current data packet has the magnitude relation as described above.

Therefore, as shown in the lower part of FIG. 7, the data in the column of the storage area number of the first data block in the management table DMNG is left as it is.

Then, thereafter, each time the data packet is supplied to the microcomputer 20, the above-mentioned processing is executed.

To summarize the above, (1) a data packet is divided into data (service identification code, program number and page number) for specifying a program, and a data packet number and a data block of the body of the program. (2) The data specifying the program is registered in the data management table DMNG so that the data does not overlap. (3) Store the text data of the program in the data storage area DSTR. (4) In the data management table DMNG, data indicating the position of the first data block of the data in the data storage area DSTR (storage area number) is also registered for each piece of data that identifies the program. (5) In the data storage area DSTR, for each data block of the data, data indicating the position of the next data block (storage area number) is also registered. (6) The data in the data management table DMNG is sorted in the order of service identification codes. Becomes

The data storage routine 100 of FIG. 2 shows an example of a routine for realizing such processing. That is, when the data packet is supplied to the microcomputer 20, the processing of the CPU 21 starts from step 101 of the routine 100, and then at step 102, the service identification code, the program number and the page number in the supplied data packet are Data management table
By checking whether or not it is stored in the DMNG, it is determined whether or not the same page in the same program as the program by the supplied data packet is managed by the management table DMNG.

Then, when the same page of the same program is not managed as in the case of FIG. 4, the process proceeds from step 102 to step 103. Then, in this step 103, as in the case of FIG. 4, for example, the service identification code, the program number, the page number, and the update flag in this data packet are registered in the management table DMNG, and the data block is stored in the data storage area. The area number when stored in the DSTR is registered, and then the process proceeds to step 104.

Further, in step 102, when the same program is managed in the management table DMNG, as in the case of FIG. 5, for example, the process proceeds directly from step 102 to step 104.

Then, in step 104, the data blocks having the same data packet number are stored in the storage area.
Whether it is stored in the DSTR or not is checked. If not stored, the process proceeds from step 104 to step 105.

Then, in this step 105, it is checked whether or not the area for storing the data block of the supplied data packet is in the storage area DSTR, and if there is, as in the case of FIGS. Proceeds from step 105 to step 106.

Then, in this step 106, as described above, the data block is stored in the storage area DSTR, and the number of the stored area is registered in the corresponding area of the management table DMNG. Then, in step 106, this routine 1
Ends 00.

In step 104, when the data block having the same data packet number is stored in the storage area DSTR, the process proceeds from step 104 to step 107, and this routine 100 ends.
In step 105, the area for storing the data block of the supplied data packet is the storage area.
If not in the DSTR, the process proceeds from step 105 to step 107, and this routine 100 ends.

In this way, in this character multiplex receiver, the data packet is divided into the data (service identification code, program number and page number) for specifying the program and the data block of the body of the program and stored in the RAM 23. To be done. The data of the body of the program is divided into data blocks, which are managed by data (data packet number) indicating the order.

Therefore, the data packet is R as it is.
The number of bits of data to be stored can be reduced as compared with the case of storing in the AM 23, and more character data can be stored in the RAM 23.

Since the data management table DMNG is created, the data can be searched easily. Further, since the data of the body of the program is stored so as not to be duplicated every time it is received, an unnecessary memory area is not required, and more data can be stored from this point as well.

Further, when storing the same program and the same page of data in the RAM 24, it is not necessary to store them in a continuous area, so that the RAM 24 can be effectively used and the number of processes can be reduced.

In the above description, various operations can be performed by the remote controller, but all of these operations can be performed by the key 42 of the FM receiver. In that case, the remote control function may not be necessary.

[0100]

According to the present invention, the number of bits of data to be stored can be reduced, and more character data can be stored in the RAM, as compared with the case where the data packet is stored in the RAM as it is.

Further, the data can be searched easily by using the data management table. Furthermore, data is R
When storing in the AM, it is not necessary to store in a continuous area, so that the RAM can be effectively used and the amount of processing is small.

[Brief description of drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart illustrating one embodiment of the present invention.

FIG. 3 is a diagram for explaining a data area and a data table.

FIG. 4 is a diagram for explaining a processing state of data.

FIG. 5 is a diagram for explaining a processing state of data.

FIG. 6 is a diagram for explaining a data processing state.

FIG. 7 is a diagram for explaining a data processing state.

FIG. 8 is a diagram for explaining a signal format.

FIG. 9 is a diagram for explaining a signal format.

FIG. 10 is a diagram for explaining a display screen.

FIG. 11 is a diagram illustrating a display screen.

[Explanation of symbols]

 12 tuner circuit 13 intermediate frequency amplifier 14 FM demodulation circuit 15 stereo demodulation circuit 20 microcomputer 21 CPU 22 ROM 23 RAM (for work area) 24 RAM (for reception buffer) 31 font ROM (character generator) 32 memory (for display) 33 Display controller 41 Decoder circuit 42 Operation key 43 Reception circuit (for remote control) 44 Forming circuit (for beep signal) 50 Display element 60 Transmitter (for remote control) 62 Operation key 100 Data storage routine DMNG data management table DSTR data storage area

Claims (3)

[Claims] 1. Data of a text of a program in characters is divided into a plurality of data blocks for each predetermined amount of data, and data for specifying a program for each data block,
A receiver for receiving the character multiplex broadcast, which is packetized into a packet having data indicating the order of the data block, and the packet is multiplexed with the main signal, and a receiving circuit for receiving the character multiplex broadcast, The memory has a memory for storing data received by the circuit, and a display element for displaying characters according to the data read from the memory. The memory has a data storage area, a data management table, and Is provided, when the packet is received, the data identifying the program in the received packet is registered in the data management table so that the data does not overlap, and the data in the received packet is Store the data blocks in the above data storage area, and for each stored data block, Data indicating the storage position of the data block before or after the data block is stored in the data storage area, and in the data management area, the same program is stored in the data storage area for each data specifying the program. Of the data blocks, the receiver that writes the data indicating the storage position of the first data block. 2. The receiver according to claim 1, wherein, for each of the stored data blocks, when data indicating a storage position of a data block before or after the data block is stored in the data storage area, A receiver configured to determine the contextual relationship according to data indicating the order of the data blocks. 3. The receiver according to claim 2, wherein, for each of the stored data blocks, when data indicating a storage position of a data block before or after the data block is stored in the data storage area, A receiver adapted to also store the data indicating the order of the data blocks.